Datasheet > MAX8879

MAX8879

更新时间： 2024-09-23 11:14:27

品牌	Logo	应用领域
美信 - MAXIM		闪光灯泵
页数	文件大小	规格书
16页	389K
描述
Charge Pump for Backlight/Flash/RGB LEDs with Safety Timer

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中文翻译

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数据手册

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MAX8879 数据手册

19-4266; Rev 0; 9/08

Charge Pump for Backlight/Flash/RGB LEDs

with Safety Timer

MAX879

General Description

Features

The MAX8879 provides complete light management for

main display backlight, subdisplay backlight (or RGB

indicator), and white LED camera flash with regulated

constant current up to 610mA total. By utilizing adap-

tive 1x/1.5x/2x charge-pump modes and very-low-

dropout current regulators, it achieves high efficiency

over the full 1-cell Li+ battery input voltage range. The

1MHz fixed-frequency switching allows for tiny external

components while the regulation scheme is optimized

to ensure low EMI and low input ripple. An integrated

derating function protects the LEDs from overheating

during high ambient temperatures.

♦ Guaranteed 610mA Continuous Drive Capability

4 LEDs at 30mA Each for Main Display

3 LEDs at 30mA Each for Sub or RGB

400mA Total for Flash

♦ 2-Wire I²C Serial Port

5-Bit (32-Step) Linear Dimming

32k Colors

Ramp-Up/Down Rates

♦ 92% Peak/83% Avg Efficiency (P

)

LED BATT

♦ Adaptive 1x/1.5x/2x Mode Switchover

♦ 0.3% (typ) LED Current Accuracy and Matching

♦ Low Input Ripple and EMI

The MAX8879 features an internally trimmed reference

to set the maximum LED current. An I²C serial port is

used for on/off control and setting the LED currents in

32 linear steps for main, sub/RGB, and movie. When

using the RGB indicator, the I²C port provides 32k col-

ors and programmable ramp-up/down rates. The cam-

era flash for flash-mode operation is enabled by an

active-low signal on the FSH pin. A safety timer is acti-

vated on the falling edge of FSH, which has an I²C-

adjustable (programmable) period of no timer, 0.5s,

1.0s, or 2.0s (default). If the safety timer period expires,

both flash and movie modes are disabled.

♦ Low 0.1µA Shutdown Current

♦ Output Overvoltage Protection

♦ I²C Programmable Flash Safety Timer

♦ Thermal Derating Function Protects LEDs

♦ 24-Pin, 4mm x 4mm Thin QFN Package

Ordering Information

PIN-

PACKAGE

PART

TEMP RANGE

Applications

24 Thin QFN

4mm x 4mm

MAX8879ETG+

-40°C to +85°C

Cell Phones and Smartphones

PDAs, Digital Cameras, Camcorders

Displays with Up to 11 LEDs

Pin Configuration appears at end of data sheet.

+Denotes a lead-free/RoHS-compliant package.

Typical Operating Circuit

1μF

INPUT

2.7V TO 5.5V

OUTPUT

UP TO 610mA

C1P

C1N

C2P

C2N

OUT

FLASH

MAIN

SUB OR RGB

10μF

4.7μF

GND

MAX8879

LOGIC

0.1μF

I C PORT

ON/OFF AND

BRIGHTNESS

SCK

SDA

FSH

FLASH

ON/OFF

PGND

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...16

中文翻译

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与MAX8879相关器件

型号	品牌	获取价格	描述	数据表
MAX8879ETG+	MAXIM	获取价格	Charge Pump for Backlight/Flash/RGB LEDs with Safety Timer
MAX887EUK15-T	MAXIM	获取价格	Low-Noise, Low-Dropout, 150mA Linear Regulators with 2982 Pinout
MAX887EUK18-T	MAXIM	获取价格	Low-Noise, Low-Dropout, 150mA Linear Regulators with 2982 Pinout
MAX887EUK25-T	MAXIM	获取价格	Low-Noise, Low-Dropout, 150mA Linear Regulators with 2982 Pinout
MAX887EUK28-T	MAXIM	获取价格	Low-Noise, Low-Dropout, 150mA Linear Regulators with 2982 Pinout
MAX887EUK29-T	MAXIM	获取价格	Low-Noise, Low-Dropout, 150mA Linear Regulators with 2982 Pinout
MAX887EUK30-T	MAXIM	获取价格	Low-Noise, Low-Dropout, 150mA Linear Regulators with 2982 Pinout
MAX887EUK32-T	MAXIM	获取价格	Low-Noise, Low-Dropout, 150mA Linear Regulators with 2982 Pinout
MAX887EUK33-T	MAXIM	获取价格	Low-Noise, Low-Dropout, 150mA Linear Regulators with 2982 Pinout
MAX887EUK36-T	MAXIM	获取价格	Low-Noise, Low-Dropout, 150mA Linear Regulators with 2982 Pinout

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